package com.houg.testorderapi.common.utils;

import java.security.MessageDigest;

/**
 * @Author: NALHOUG
 * @Time: 2019/11/8 15:16
 * @Explain: Md5加密
 */

public class Md5Utils {
    private final static String[] hexDigits = {"0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "a", "b", "c", "d", "e", "f"};

    /**
     * 转换字节数组为16进制字串
     * @param b 字节数组
     * @return 16进制字串
     */
    private static String byteArrayToHexString(byte[] b) {
        StringBuffer resultSb = new StringBuffer();
        for (byte element : b) {
            resultSb.append(byteToHexString(element));
        }
        return resultSb.toString();
    }

    private static String byteToHexString(byte b) {
        int n = b;
        if (n < 0) {
            n = 256 + n;
        }
        int d1 = n / 16;
        int d2 = n % 16;
        return hexDigits[d1] + hexDigits[d2];
    }

    /**
     * 单次加密
     */
    public static String MD5Encode(String origin) {
        String resultString = null;
        try {
            resultString = origin;
            MessageDigest md = MessageDigest.getInstance("MD5");
            resultString = byteArrayToHexString(md.digest(resultString.getBytes()));
        } catch (Exception ex) {
        }
        return resultString;
    }

    /**
     * 加密三次
     */
    public static String encrypt3Times(String password) {
        return MD5Encode(MD5Encode(MD5Encode(password)));
    }

}
